2. Keys
car keys

Long ago replaced by the fob as the preferred way to open trunks and unlock doors -- when was the last time you saw an external keyhole anywhere on a car? -- stamped metal keys have been made redundant by ignitions that use start/stop buttons. On higher-end cars, the fob unlocks the door when the key-holder approaches the car, so it need not be lifted from a pocket or purse. Parking garage attendants complain that forgetful customer are forever walking away with their keys and leaving their cars immobilized, but they are in the minority. Coming next: cars that can be unlocked and started with your smartphone.

  @FortuneMagazine - Last updated July 02 2013 05:57 AM ET
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